Discover Financial Services is offering U.S. military personnel and their families double cash-back bonuses and double airline miles on purchases made with Discover cards this summer, the company announced today. The double rewards are limited to the first $1,000 spent at more than 175 U.S. military bases in the United States. and at additional bases overseas during the campaign, which will run from July 4 through Labor Day. Discover also will match by up to 20% any cash-back bonuses that Discover cardholders donate to Operation Homefront between July 13 and Labor Day. Operation Homefront provides soldiers and their families with emergency funds, social networking opportunities, computers so families can stay in touch via the Internet, furniture, clothing and household goods, and help moving when members of the military are redeployed.